Bioreactor acts as a biological treatment processor and the mem-brane is used as a filter in the filtration process. Despite its reputation
of being a reliable treatment process, the interest in MBR has slowed
down for the past three decades mainly due to the high cost of mem-brane and membrane maintenance. The cost of the membrane has in-clined together with the growth of membrane technology and the
MBR technology is becoming more acceptable for industrial applica-tions. In 1990s, submerged MBR was commercialized and it was
found that this system had low operational cost